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SDZ Construction: Mortars

SDZ Construction: Mortars. Inter-service Resident Range Safety Course (Intermediate). Mortars tend to be low-velocity weapons firing a fin- or spin-stabilized bomb at high angles. They are often muzzle loaded and may or may not be rifled. M224 60mm Lightweight Mortar. M120 120mm Heavy Mortar.

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SDZ Construction: Mortars

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  1. SDZ Construction:Mortars Inter-service Resident Range Safety Course (Intermediate)

  2. Mortars tend to be low-velocity weapons firing a fin- or spin-stabilized bomb at high angles. They are often muzzle loaded and may or may not be rifled. August 2003

  3. M224 60mm Lightweight Mortar M120 120mm Heavy Mortar August 2003

  4. M252 (81mm) Medium Extended-Range Mortar August 2003

  5. M30 4.2 inch (107mm) Heavy Mortar August 2003

  6. Mortar Ammo 60mm 81mm 120mm August 2003

  7. M734A1 Multi-Option Fuze • The M734 multi-option fuze is the U.S. Army’s standard electronic multi-option fuze. Proximity, near-burst, impact, and delay settings are all provided in this single fuze. August 2003

  8. PRX: ProximityThe fuze comes set to PRXBurst height is 3 - 13ft. (1-4m) NSB: Near-surface (nonjamming)Burst height is 0-3 ft (0-1m) IMP: Impact (SQ) DLY: Delay (0.050 seconds) M734A1 Multi-Option Fuze August 2003

  9. Mils Scale Degrees Scale Index August 2003

  10. Area B Target Area 8PE Area A Indirect-Fire SDZ for Mortars 8PE Distance X 25° Firing Point August 2003

  11. Legend for Mortars August 2003

  12. Constructing an Indirect-Fire SDZ for Mortars • Construct the SDZ for the 81mm M29 Mortar firing HE, M374A2. • Probable error, range (1 PER): 12m • Probable error, deflection (1PED): 6m • Dimensions for this SDZ are found in DA-PAM 385-63, Chapter 10, Table 10-1 and Figure 10-1. August 2003

  13. Reverse EngineeringReverse engineering is used to create SDZs when: • Physical or administrative boundaries exist • A limited firing scenario is in effect • Detailed control measures are in place • Mission is directed August 2003

  14. MissionAll projectiles, to include all shrapnel, must land within the impact area. August 2003

  15. + • Place the following reference marks. NU90031280 NU93951275 • Plot the coordinates for the limits of the Impact Area. NU91050920 NU93950915 • Draw the boundary of the Impact Area. • Plot the firing point. NU93410820 + August 2003

  16. Scribe the worst-case arc just within the downrange boundary of the impact area to define the far edge of Area B. • From Table 10-1, find the measurement for Area A. • Measurement for Area A = 400m • At the ends of the arc, measure in 400m and draw tic marks. August 2003

  17. Draw straight lines through the tic marks to the firing point. • These lines establish the inside limits of Area A. • From the inside limits of Area A, measure out 400m. • Draw tic marks. August 2003

  18. 25° 25° • Draw straight lines through the tic marks. • These lines establish the outside limits of Area A. • From the firing point, measure 25° to the right and left of the inside limits of Area A. • Draw tic marks. August 2003

  19. Area A 25° 25° • From the firing point, draw straight lines through the tic marks. • This completes Area A. August 2003

  20. Area A • From Table 10-1, find the measurement for Area B. 400m • Area B = • From the downrange arc, measure 400m back towards the firing point. • Draw a tic mark. August 2003

  21. Area B Area A • From the firing point, scribe an arc through the tic mark. • This completes Area B. • Erase unnecessary lines. August 2003

  22. Area B Area A • From the firing point, scribe an arc through the tic mark. • This completes Area B. • Erase unnecessary lines. August 2003

  23. Area B Area A • Probable error for deflection for mortars is 8PE. • (PED) for this weapon is 6m. • Compute the probable errors for deflection (PED). 8 x 6 = 48m(ˆ50m) • Measure 50m in from the inside limits of Area A. • Draw tic marks. August 2003

  24. Area B Area A • Draw straight lines through the tic marks to the firing point. • Probable error for range for mortars is 8PE. • (PER) for this weapon is 12m. August 2003

  25. Area B Area A • Compute the probable errors for range (PER). 8 x 12 = 96m(ˆ100m) • Measure 100m in from the up range limit of Area B. • Draw a tic mark. • From the firing point, scribe an arc through the tic mark. • This establishes the maximum allowable range for the mortar. August 2003

  26. Area B Area A • This completes the probable error areas. PE August 2003

  27. Area B Area A • This completes the probable error areas. PE • The Impact Area has now been defined. August 2003

  28. Area B Area A • Scribe an arc just inside the up range boundary of the impact area as shown. PE • Measure downrange the value of Area B (400m). • Draw a tic mark. • From the firing point, scribe an arc through the tic mark. August 2003

  29. Area B Area A • Measure downrange the value of the (PER) (100m) to the arc just drawn. PE • Draw a tic mark. • From the firing point, scribe an arc through the tic mark. • This arc establishes the minimum allowable range for the mortar. August 2003

  30. Legend for Mortars August 2003

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